G - Physics – 07 – C
Patent
G - Physics
07
C
58/0.3
G07C 5/04 (2006.01) G08B 19/00 (2006.01)
Patent
CA 1238492
-22- Abstract of the Disclosure Hour Meter Apparatus and Method Electronic hourmeter devices having non-volatile memories are useful, for example, in industrial vehicles. Advantageously, such non-volatile memories should be free from a need for battery back-up systems and should minimize the number of changes of the internal memory registers. The subject electronic hourmeter apparatus includes both a dynamic memory device and a non-volatile memory device. Data is maintained in each of the memory devices and memory bit changes are minimized by utilizing a gray coded binary representation of a portion of the data and by systematically altering the addressed memory location of a portion of the data in response to one of the stored data values. Data storage occurs both periodically and in response to disconnection of the vehicle battery. Thus, the disclosed electronic hourmeter apparatus 10 advantageously maintains the integrity of the stored data, minimizes the number of bit changes that occur in the non-volatile memory device, and avoids the need for a battery back-up.
488260
Caterpillar Industrial Inc.
Kirby Eades Gale Baker
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